Discussion

Explanation:

1st beggar received money from – 1st person
2nd beggar received money from – 1st and 2nd persons
3rd beggar received money from – 1st and 3rd persons
4th beggar received money from – 1st, 2nd and 4th persons

… and so on

We can see that the nth beggar will receive amount from those people whose numbers are factors of n.

Amount received by 1st beggar - 1
Amount received by 2nd beggar – 1 + 2 = Rs. 3
Amount received by 3rd beggar – 1 + 3 = Rs. 4
Amount received by 4th beggar – 1 + 2 + 4 = Rs. 7

… and so on

We can see that the nth beggar will receive amount equal to sum of the factors of n.

∴ Amount received by 
Beggar 2 ⇒ 1 + 2 = Rs. 3
Beggar 4 ⇒ 1 + 2 + 4 = Rs. 7
Beggar 9 ⇒ 1 + 3 + 9 = Rs. 13

∴ Amount received by beggar 2, 4 and 9 is 3 + 7 + 13 = Rs. 23

Hence, 23.

» Your doubt will be displayed only after approval.


Doubts


Feedback

Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.


© 2024 | All Rights Reserved | Apti4All